The only thing more fun than shooting a cap n ball revolver is hitting what you aim at. I have a colt 1851 navy that shoots a 3" group at 25 yards but it is 12" high. I think I have to take over 1/8" of meat from the top of the hammer. Please check my math. The distance between the front sight and the back sight is 10.5". The distance between the front sight and the target is 25 yards which equals 900". If I divide 900 by 10.5 this gives me 85.71. I think that becomes a ratio between the sight radius and the distance to the target. So now any change I do to the sight elevation will be multiplied by the ratio 85.71 at the target,or I can divide what I want to do at the target by 85.71 and that tells me how far to change the elevation of my sight. So if I want to lower the impact 12" at 25 yds(900") I have to divide 12" by 85.71 which is .14". This now tells me I think, that I have to either raise the front sight or lower the rear sight by .14". I don't want to mess with the front sight so I have to file .14" off of my hammer. If I shave .14" off the hammer the part of the hammer that goes above the nipple will be gone. I am sure the gun will still fire because that part does not hit the cap but I question how safe this is. I think that piece of metal is a guard that keeps the cap from fragmenting and flying upwards. Has anyone done this. Gentleman what are your thoughts.